WPF中的虛擬鍵盤：模擬真正的輸入設備？

Question

我想在Win7中創建一個簡單的虛擬鍵盤像

|---|---|---| 9 char in first block (abcdefgijk) 

|---|---|---| 

|---|---|---|

有9個按鈕，點擊第一個按鈕切換到其他視圖時。

|---|---|---| 
a  b c 
|---|---|---| 
e f g  
|---|---|---| 
i j k

現在我很困惑如何點擊一個按鈕像按鍵盤可以生成字符輸出到另一個應用程序。我正在使用

System.Windows.Forms.SendKeys.SendWait(sendString); 

但它不起作用。我知道sendString是正確的，因爲我認爲它像Console.WriteLine(sendString);。

另一個問題是單擊按鈕時焦點不會變回到按鈕。

任何人都有如何實現這個鍵盤的解決方案？

謝謝！

感謝您的回覆，實際上我已經添加這些代碼 它也有一些問題，當我點擊按鈕很多時間。和焦點也不能工作，當我點擊按鈕它總是專注於按鈕。在這個示例中它只包含2個按鈕。你能幫助看看這些代碼發現錯誤。許多人認爲！

namespace WpfApplication5 
{ 
    public partial class UserControl1 : UserControl 
    { 
     [DllImport("user32.dll")] 
     public static extern int SetWindowLong(IntPtr hWnd, int nIndex, IntPtr dwNewLong); 

     [DllImport("user32.dll", SetLastError = true)] 
     public static extern UInt32 GetWindowLong(IntPtr hWnd, int nIndex); 

     private IInputElement focusedInputElement; 
     private Window parentWindow; 
     private List<Button> keyCollection = new List<Button>(); 

     public UserControl1(Window parent) 
     { 
      this.parentWindow = parent; 
      this.setupKeyboardControl(); 
     } 

     public UserControl1(IInputElement elementToFocusOn) 
     { 
      // set focus 
      this.focusedInputElement = elementToFocusOn; 
      // setup this control 
      this.setupKeyboardControl(); 
     } 

     private void setupKeyboardControl() 
     { 
      InitializeComponent(); 
      // add all keys to internal collection 
      this.addAllKeysToInternalCollection(); 
      // install clicks 
      this.installAllClickEventsForCollection(this.keyCollection); 
     } 

     private void addAllKeysToInternalCollection() 
     { 
      // itterate all panels 
      // itterate all buttons 
      // add to list 
      Console.WriteLine("Run at here"); 
      this.keyCollection.Add(A); 
      this.keyCollection.Add(B); 
     } 

     /// <summary> 
     /// Install click events for all keys in a collection 
     /// </summary> 
     /// <param name="keysToInstall"></param> 
     private void installAllClickEventsForCollection(List<Button> keysToInstall) 
     { 
      // itterate all 
      foreach (Button buttonElement in keysToInstall) 
      { 
       // install click event 
       buttonElement.Click += new RoutedEventHandler(buttonElement_Click); 
      } 
     } 

     /* private void Window_KeyDown(object sender, KeyEventArgs e) 
     { 
      if (e.Key == Key.A) 
       A.RaiseEvent(new RoutedEventArgs(Button.ClickEvent)); 
      else if (e.Key == Key.B) 
       B.RaiseEvent(new RoutedEventArgs(Button.ClickEvent)); 
     }*/ 

     void buttonElement_Click(object sender, RoutedEventArgs e) 
     { 
      // create variable for holding string 
      String sendString = ""; 

      try 
      { 
       // stop all event handling 
       e.Handled = true; 

       // set sendstring to key 
       sendString = ((Button)sender).CommandParameter.ToString(); 

       // if something to send 
       if (!String.IsNullOrEmpty(sendString)) 
       { 
        // if sending a string 
        if (sendString.Length > 1) 
        { 
         // add {} 
         sendString = "{" + sendString + "}"; 
        } 

        // if a focusable element has been specified 
        if (this.focusedInputElement != null) 
        { 
         Console.WriteLine("1",sendString); 
         // set keyboard focus 
         Keyboard.Focus(this.focusedInputElement); 
         // set normal focus 
         this.focusedInputElement.Focus(); 
        } 

        // send key to simulate key press 
        // System.Windows.Forms.SendKeys.Send(sendString); 

        System.Windows.Forms.SendKeys.SendWait(sendString); 
        Console.WriteLine(sendString); 

       } 
      } 
      catch (Exception) 
      { 
       // do nothing - not important for now 
       Console.WriteLine("Could not send key press: {0}", sendString); 
      } 
     } 

     private void UserControl_Loaded(object sender, RoutedEventArgs e) 
     { 
      // if we have specified a parent 
      if (this.parentWindow != null) 
      { 
       // Get this window's handle 
       IntPtr HWND = new WindowInteropHelper(this.parentWindow).Handle; 
       Console.WriteLine("Run in UserControl load"); 
       // style of window? 
       int GWL_EXSTYLE = (-20); 
       // get - retrieves information about a specified window 
       GetWindowLong(HWND, GWL_EXSTYLE); 
       // set - changes the attribute of a specified window - I think this stops it being focused on 
       SetWindowLong(HWND, GWL_EXSTYLE, (IntPtr)(0x8000000)); 
      } 
     } 
    } 
} 

Answer 1

最可靠的方法做，這是使用Win32 API

[DllImport("user32.dll")] 
public static extern uint SendInput(uint nInputs, ref INPUT pInputs, int cbSize); 

[DllImport("user32.dll", EntryPoint = "SendInput")] 
public static extern uint SendInput(uint nInputs, InputKeys[] inputs, int cbSize); 

還有就是要在CodePlex上

http://wosk.codeplex.com/做完整的工作程序是什麼一個很好的例子